- Does baremetal or system state backup backup the RAID configurations?
No - most backup software only will back up data at the OS level

- Does the new machine have to have the same hardware specs as with the machine where the backup came from?
This depends on your backup software. Most backup platforms can restore to different types of hardware

- Does the new machine need to have the same raid configuration or harddisk size as the machine where the backup came from?
No